6th grade vocabulary simple invertebrates Ch 2 section 1

Created by givenchy1 Teacher

symmetry

the way an animal's body parts match up around a point or central line

bilateral symmetry

arrangement of body parts so there are distinct left and right halves that mirror each other

radial symmetry

Parts repeat around center of the body

asymmetrical

not identical on both sides of a central line

neurons

nerve cells

nerve cords

a bundle of long extensions of nerve cell bodies, lead away from the brain

ganglion

group of nerve cells

gut

the pouch where food is digested in animals

coelum

body cavity in an organism, region where organs are located

pores

tiny openings on the skins surface

collar cells

flagellated cells that push water through a sponge

osculum

the large opening at the top of a sponge

regenerate

replace (tissue or a body part) through the formation of new tissue

spicules

small, spike shaped particles of calcium carbonate or silicon dioxide that make up the skeleton of some sponges

Cnidarian

invertebrates that have stinging cells and take food into a central body cavity

medusa

a free-swimming cnidarian with a bell-shaped body and tentacles

polyp

The cup-shaped body form of a cnidarian that is generally attached to a surface

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